Manufacturing device of the curved metal tube and rod with an arbitrary section

ABSTRACT

The purpose of the present invention is to propose a new way of manufacturing curved metal tubes or rods with arbitrary sections and eliminating the conventional bending defects such as thinning and thickening in the wall of tube, distortion of the section, and wrinkling and folding on the surface by the extrusion bending process that can extrude and weld together one or more billets inside dies cavity, and can bend them during extrusion due to the gradient of extrusion velocities controlled by the eccentricity of the cavity sections between the entrance and the exit of the eccentric conical extrusion bending dies and conical plug, or by the relative size of the holes of multi-hole container, or by the relative moving velocity of multi-punches.

TECHNICAL FIELD

[0001] This invention relates to the manufacturing devices of curvedmetal tubes or rods with arbitrary sections. In details, it relates tothe devices such that a curved hollow tube or a curved solid rod withvarious sections like as polygon and longitudinal fins can be extrudedand bended very easily with needed curvature by the extrusion bendingprocess.

BACKGROUND ARTS

[0002] Curved metal tubes or rods have been bended by the second bendingprocess after the first extruding of straight tubes or rods by theextrusion process. However, it is difficult to get precious and standardcurved products, because the bending process changes the uniform sectionof extruded product due to the deformation by bending. Especially, asshown in the lower part of the FIG. 8, it is very difficult to bend theextruded products with longitudinal fins inside or outside the wall oftube of irregular sections by the conventional bending process, becauseit may cause some defects such as thinning and thickening in the wall oftube, distortion of the section, and wrinkling and folding on thesurface.

DISCLOSURE OF INVENTION

[0003] The purpose of the present invention is to propose a new way ofmanufacturing curved metal tubes or rods with arbitrary sections andeliminating the conventional defects in bending by the one extrusionbending process that can extrude and weld together one or more billetsinside dies cavity, and can bend them during extrusion due to thegradient of extrusion velocities controlled by the eccentricity ofcavity sections between the entrance and the exit of the conicalextrusion bending dies, or by the relative size of the holes of themulti-hole container, or by the relative moving velocity ofmulti-punches.

[0004] The present invention for this purposes has the characteristicsconsisted of two types of device, the one of them is manufacturingdevice extruding curved metal tubes(100) with arbitrary sections, and itis composed of the multi-hole container(C) with eccentric conicalplug(3) and with multi-holes(2) inserting one or more hot metalbillets(B); the extrusion punch(A) with one or more punches(1) to pushthe billets(B) inserted in the multi-hole container(C); and theeccentric conical extrusion bending dies(D) with an arbitrary cavity(4)section.

[0005] The other is manufacturing device of curved metal rods(200) witharbitrary sections, and it is composed of the multi-hole container(C)with multi-holes(2) inserting one or more hot metal billets(B); theextrusion punch(A) with one or more punches(1) to push the billets(B)inserted in the multi-hole container(C); and the eccentric conicalextrusion bending dies(D) with an arbitrary cavity(4) section.

[0006] This present invention will be described further below withattached drawings.

[0007]FIG. 1 shows an overall perspective view with partially sectionalview of the extrusion bending device for extruding the curved metaltube(100) with rectangular section. And it consists of the extrusionpunch(A) with one or more punches(1); one or more hot metal billets(B);the multi-hole container(C) with the eccentric rectangular conicalplug(3) and with multi-holes(2) inserting one or more hot metalbillets(B); and the eccentric conical extrusion bending dies(D) with theeccentric rectangular conical cavity(4) to be able to insert aneccentric rectangular conical plug(3).

[0008] The extrusion punch(A) consists of one or more punches(1) whichcan be assembled together to push the hot metal billets(B) with samevelocity or can be separated individually to push the each billet witheach different velocity.

[0009] The hot metal billet(B) is an arbitrary metal billet heated tothe temperature used generally in the hot extrusion process. The upperpart of multi-hole container(C) has one or more holes(2) through whichthe one or more hot metal billet(B) can pass, and in order to controlthe bending curvature of curved tubes or rods, the relative diameter ofthe holes(2) can be adjusted to control the gradient of extrusionvelocity at dies exit due to the different amount of billets in eachhole.

[0010] And the lower part of multi-hole container(C) has onecircumferential groove(5) passed through and connected to one or moreholes(2), and has the eccentric conical plug(3) surrounded by the ruledsurface connecting the inner circular contour of the circumferentialgroove(5) at the bottom of plug(3) with the rectangular contour of thesection at the end of plug(3).

[0011] The eccentricity of eccentric conical plug(3) means that thecenter of section enclosed by the inner circular contour of thecircumferential groove(5) at the bottom of plug(3) does not lie on thesame line as the perpendicular line passing through the center of therectangular section or an arbitrary section at the end of plug(3).

[0012] And an arbitrary section means that it includes one of thevarious sections of extruded products, for example, the polygonalsection like as rectangular tube and rod, the cylindrical or halfcylindrical section, the section with longitudinal fins(6) inside oroutside the wall of tube, and H-section, and so on.

[0013] The extrusion bending dies(D) has the eccentric conical cavity(4)surrounded by the ruled surface connected the contour of a circularcavity section at the conical dies(D) entrance with the contour of arectangular or an arbitrary cavity section at the conical dies(D) exit.

[0014] And the eccentricity of the eccentric conical cavity(4) meansthat the center of the circular cavity section at the conical dies(D)entrance does not lie on the same line as the perpendicular line passingthrough the center of the rectangular or an arbitrary cavity section atthe conical dies(D) exit.

[0015]FIGS. 6 and 7 show overall sectional view of the extrusion bendingdevice for extruding the curved metal rod(200), and it consists of theextrusion punch(A) with one or more punches(1); one or more hot metalbillets(B); the multi-hole container(C) to be able to pass one or morehot metal billets(B) through the multi-holes(2); and the extrusionbending dies(D) with the eccentric conical cavity(4) surrounded by theruled surface connected the contour of an arbitrary cavity section atthe conical dies(D) entrance with the contour of an arbitrary cavitysection at the conical dies(D) exit.

[0016] And the eccentricity of the eccentric conical cavity(4) sectionmeans that the center of an arbitrary cavity section at the conicaldies(D) entrance does not lie on the same line as the perpendicular linepassing through the center of an arbitrary cavity section at the conicaldies(D) exit.

BRIEF DESCRIPTION OF DRAWINGS

[0017] The nature and mode of operation of preferred embodiments of thepresent invention will now be more fully described in the followingdetailed description, taken with the accompanying drawings wherein:

[0018]FIG. 1 is a perspective view with partially sectional view of theextrusion bending device for extruding the curved rectangular metal tubeas a representative example of the present invention;

[0019]FIG. 2 is a perspective view of a flow of the extrusion materialused in the extrusion bending process of the curved rectangular metaltube with four hot metal billets;

[0020]FIG. 3 is a cross-sectional view for example of the inserting hotmetal billets into the multi-hole container;

[0021]FIG. 4 is a cross-sectional view for example before insertingextrusion punches into the multi-hole container;

[0022]FIG. 5 is a cross-sectional view for example of the extrusion ofthe curved metal tube by pushing hot metal billets into the multi-holecontainer by extrusion punches;

[0023]FIG. 6 is a cross-sectional view before inserting one hot metalbillet into the container for the extrusion bending of the curved metalrod as an example of the present invention;

[0024]FIG. 7 is a cross-sectional view for the extrusion bending of thecurved metal rod as an example of the present invention;

[0025]FIG. 8 is a view of examples of the products of curved metal tubesor rods that can be manufactured by the present invention.

EXPLANATION OF THE SYMBOL AT THE INDICATED POINT IN THE DRAWINGS

[0026] 1: punch 2: hole 3: conical plug 4: cavity 5: circumferentialgroove 6: longitudinal fin A: extrusion punch B: hot metal billet C:container D: extrusion bending dies 100: curved metal tube 200: curvedmetal rod

BEST MODE FOR CARRYING OUT THE INVENTION

[0027] The device of the present invention is intended to be installedin hot metal extrusion machine so that the present invention can beutilized in the manufacturing of curved metal tubes(100) or rods(200).The exemplary embodiments of a manufacturing process of extrudingrectangular curved metal tube are illustrated in the viewing FIGS. 1-5with following descriptions of the present invention.

[0028] For the exemplary embodiment, the device is illustrated in anexample that consists of the extrusion punch(A) with four punches(1);four hot metal billets(B); the multi-hole container(C) with fourholes(2); and the conical extrusion bending dies(D) with a rectangularcavity(4) section.

[0029] For more explanation of the detailed manufacturing process,first, the four hot metal billets(B) heated to the degree of hotextrusion temperature are inserted into the multi-hole container(C) withfour holes(2), are pushed and moved by four punches(1) loaded with thecompressive force, and are extruded to one circular tube welded togetherin the circumferential groove(5) passed through and connected to thefour holes(2) at the lower part of multi-hole container(C).

[0030] Next, the one extruded circular tube welded in thecircumferential groove(5) is pushed and passed through into thecavity(4) between the inner surface of the eccentric conical extrusionbending dies(D) and the outer surface of the eccentric conical plug(3).

[0031] And the gradient of the extrusion velocity on the exit cavitysection of conical extrusion bending dies(D) due to the eccentricity inthe conical plug(3) and in the conical extrusion bending dies(D) shouldmake bending in the extruded product to the opposite direction of theeccentricity of the conical extrusion dies(D), as shown in FIG. 5.

[0032] And the curvature of the extruded product, that is, the amount ofbending of rectangular curved tube(100) can be controlled by theeccentricity between the circular cavity section in the circumferentialgroove(5) at the dies entrance and the rectangular cavity section at thedies exit, or it can be controlled by the changing the relative diameterof the two symmetric holes(2) of the multi-hole container(C), or it canbe controlled by the relative moving velocity of two symmetricpunches(1) inserted into the four hole(2).

[0033] And it is possible to manufacture the curved metal tube(100)whose curvature varies on the length of extruded product due to thegradient of the moving velocities of each billet controlled by therelative moving velocity of two symmetric punches(1) during theextrusion process.

[0034] In brief summarization of the extrusion bending process of curvedtubes, first, the four hot metal billet(B) are welded together in thecircumferential groove(5) and they are extruded to one circular tube,when one circular tube is pushed and passed through into the diecavity(4) between the dies surface and the plug surface, and then thebending should happen due to the gradient of extrusion velocity duringthe extrusion such that the moving velocity in left side is faster thanthe velocity in right side as shown in FIG. 5. The curvature of thecurved product can be controlled by the eccentricity or by the relativediameter of four holes(2) or by the relative velocity of fourpunches(1).

[0035] Although the present example for the embodiment is illustrated inthe case of the manufacturing of rectangular curved metal tube(100),however, according to the shape of the end of conical plug(3) connectedto the multi-hole container(C) and to the shape of opening of theconical extrusion dies(D), it is possible to manufacture easily theproducts like as cylindrical and polygonal thin curved tube(100) withlongitudinal fins(6) inside or outside of tube wall as shown in FIG. 8,and the curvature of the products can be controlled preciously in avariety of range by the eccentricity or by the relative size ofmulti-holes(2) or the relative moving velocity of multi-punches (1).

[0036] And, as shown in FIGS. 6-7, in the case of the manufacturing ofcurved metal rod(200), after that the one or more hot metal billets(B)are inserted into multi-hole container(C) with one or more holes(2) andthey are pushed by multi-punches(1), they are welded together in theeccentric conical extrusion bending dies cavity(4) without the conicalplug(3) connected to multi-hole container(C), and it is extruded to anarbitrary shaped curved metal rod(200), and when it is extruding in thedies cavity, the bending should happen by the gradient of extrusionvelocity during the extrusion such that the moving velocity in left sideis faster than the moving velocity in right side as shown in FIGS. 6-7.

[0037] The curvature of the curved metal rod(200) can be controlled bythe eccentricity between an arbitrary cavity section at the diesentrance and an arbitrary cavity section at the dies exit or by therelative diameters of multi-holes(2) or by the relative moving velocityof multi-punches(1).

[0038] Although the two exemplary embodiments are illustrated asdesirable examples of the case of the extrusion bending process withfour hot billets(B) and four punches(1) and four-hole container(C),however, the fulfillment with the technically applicable range of thepresent invention can be made in any other case of the extrusion bendingprocess using with one or more billets(B), with one or more punches(1),and with one or more holes(2).

INDUSTRIAL APPLICABILITY

[0039] The present invention is attributed to the increase of theproductivity by combining extrusion process and bending process, so thatthe cost of production should be deceased by manufacturing curved metalproducts simultaneously in the one extrusion bending process of thepresent invention. And it is possible to manufacture the curved tubesand rods without defects such as wrinkling and folding on the surface,and such as distortion in the section, and thickness change of the wallto be occurred easily when the non-symmetric hollow tubes and rods withlongitudinal fins(6) should be bended.

1. The manufacturing device for the curved metal tube(100) with anarbitrary section that consists of the extrusion punch(A) with one ormore punches(1); one or more hot metal billets(B); the multi-holecontainer(C) with one or more holes(2) inserting the one or more hotmetal billets(B), and it is connected with the eccentric conical plug(3)surrounded by the ruled surface connecting the arbitrary inner contourof the circumferential groove(5) at the bottom of plug(3) with thearbitrary contour of section to be extruded at the end of plug(3); andthe eccentric conical extrusion bending dies(D) inserting the eccentricconical plug(3) inside the eccentric conical cavity(4) surrounded by theruled surface, and it has eccentricity that the center of an arbitrarycavity section at the conical dies(D) entrance does not lie on the sameline as the perpendicular line passing through the center of anarbitrary cavity section at the conical dies(D) exit.
 2. Themanufacturing device for the curved metal rod(200) with an arbitrarysection that consists of the extrusion punch(A) with one or morepunches(1); one or more hot metal billets(B); the multi-holecontainer(C) with the one or more holes(2) inserting the one or more hotmetal billets(B); and the eccentric conical extrusion bending dies(D)with the eccentric conical cavity(4) surrounded by the ruled surface,and it has eccentricity that the center of an arbitrary cavity sectionat the conical dies(D) entrance does not lie on the same line as theperpendicular line passing through the center of an arbitrary cavitysection at the conical dies(D) exit.
 3. As claimed in claim 1 or inclaim 2, the manufacturing device for curved metal tubes(100) orrods(200) with an arbitrary section that consists of the extrusionpunch(A) with four punches(1); and four hot metal billets(B); andmulti-hole container(C) with the four holes(2).
 4. As claimed in claim 1or in claim 2, the manufacturing device for curved metal tubes(100) androds(200) with an arbitrary section like as cylindrical section orpolygonal section and like as cylindrical and polygonal section withlongitudinal fins(6) inside or outside the extruded products.
 5. Asclaimed in claim 1 or in claim 2, the manufacturing device for curvedmetal tubes(100) and rods(200) with an arbitrary section like as Hsection to be extruded.
 6. As claimed in claim 1 or in claim 2, themanufacturing method for curved metal tubes(100) or rods(200) such thatthe curvature of curved products can be controlled by the eccentricityof the cavity(4) sections between the entrance and the exit of theeccentric conical extrusion bending dies(D) and conical plug(3), or bythe relative size of the holes(2) of multi-hole container(C), or by therelative moving velocity of multi-punches(1).